lmdb: fix Windows commit offset handling past 2GiB

Author: ImplOfAnImpl

third_party/lmdb-rs-mintlayer/lmdb-sys/lmdb/libraries/liblmdb/mdb.c

@@ -3668,7 +3668,11 @@ mdb_page_flush(MDB_txn *txn, int keep)
 	unsigned	psize = env->me_psize, j;
 	int			i, pagecount = dl[0].mid, rc;
 	size_t		size = 0;
+#ifdef _WIN32
+	mdb_size_t	pos = 0;
+#else
 	off_t		pos = 0;
+#endif
 	pgno_t		pgno = 0;
 	MDB_page	*dp = NULL;
 #ifdef _WIN32
@@ -3726,11 +3730,14 @@ mdb_page_flush(MDB_txn *txn, int keep)
 		 */
 		DPRINTF(("committing page %"Yu, pgno));
 		memset(&ov, 0, sizeof(ov));
-		ov.Offset = pos & 0xffffffff;
-		ov.OffsetHigh = pos >> 16 >> 16;
+		ov.Offset = (DWORD)(pos & 0xffffffffULL);
+		ov.OffsetHigh = (DWORD)(pos >> 32);
 		if (!WriteFile(env->me_fd, dp, size, NULL, &ov)) {
 			rc = ErrCode();
-			DPRINTF(("WriteFile: %d", rc));
+			DPRINTF((
+				"WriteFile: %d, pos=%"Yu", ov=(0x%08X,0x%08X), size=%"Z"u, pgno=%"Yu,
+				rc, pos, ov.OffsetHigh, ov.Offset, size, pgno
+			));
 			return rc;
 		}
 #else